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<div class="title">samples/cpp/distrans.cpp</div>  </div>
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<p>An example on using the distance transform</p>
<div class="fragment"><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="../../d1/d4e/utility_8hpp.html">opencv2/core/utility.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d1/d4f/imgproc_2include_2opencv2_2imgproc_8hpp.html">opencv2/imgproc.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d6/d87/imgcodecs_8hpp.html">opencv2/imgcodecs.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d4/dd5/highgui_8hpp.html">opencv2/highgui.hpp</a>&quot;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;stdio.h&gt;</span></div><div class="line"></div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d8/dcc/namespacestd.html">std</a>;</div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d2/d75/namespacecv.html">cv</a>;</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> maskSize0 = <a name="a0"></a><a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaaa68392323ccf7fad87570e41259b497a8a8b17ed6012f6ce42e56f302c07d481">DIST_MASK_5</a>;</div><div class="line"><span class="keywordtype">int</span> voronoiType = -1;</div><div class="line"><span class="keywordtype">int</span> edgeThresh = 100;</div><div class="line"><span class="keywordtype">int</span> distType0 = <a name="a1"></a><a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaa2bfbebbc5c320526897996aafa1d8ebae5b2dfaf2ba5024d7ce47885001fad86">DIST_L1</a>;</div><div class="line"></div><div class="line"><span class="comment">// The output and temporary images</span></div><div class="line"><a name="_a2"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> gray;</div><div class="line"></div><div class="line"><span class="comment">// threshold trackbar callback</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> onTrackbar( <span class="keywordtype">int</span>, <span class="keywordtype">void</span>* )</div><div class="line">{</div><div class="line">    <span class="keyword">static</span> <span class="keyword">const</span> <a name="_a3"></a><a class="code" href="../../d1/da0/classcv_1_1Scalar__.html">Scalar</a> colors[] =</div><div class="line">    {</div><div class="line">        <a name="a4"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0,0,0),</div><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(255,0,0),</div><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(255,128,0),</div><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(255,255,0),</div><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0,255,0),</div><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0,128,255),</div><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0,255,255),</div><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0,0,255),</div><div class="line">        <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(255,0,255)</div><div class="line">    };</div><div class="line"></div><div class="line">    <span class="keywordtype">int</span> maskSize = voronoiType &gt;= 0 ? <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaaa68392323ccf7fad87570e41259b497a8a8b17ed6012f6ce42e56f302c07d481">DIST_MASK_5</a> : maskSize0;</div><div class="line">    <span class="keywordtype">int</span> distType = voronoiType &gt;= 0 ? <a name="a5"></a><a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaa2bfbebbc5c320526897996aafa1d8ebaff0d1f5be0fc152a56a9b9716d158b96">DIST_L2</a> : distType0;</div><div class="line"></div><div class="line">    <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> edge = gray &gt;= edgeThresh, dist, labels, dist8u;</div><div class="line"></div><div class="line">    <span class="keywordflow">if</span>( voronoiType &lt; 0 )</div><div class="line">        <a name="a6"></a><a class="code" href="../../d7/d1b/group__imgproc__misc.html#ga8a0b7fdfcb7a13dde018988ba3a43042">distanceTransform</a>( edge, dist, distType, maskSize );</div><div class="line">    <span class="keywordflow">else</span></div><div class="line">        <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ga8a0b7fdfcb7a13dde018988ba3a43042">distanceTransform</a>( edge, dist, labels, distType, maskSize, voronoiType );</div><div class="line"></div><div class="line">    <span class="keywordflow">if</span>( voronoiType &lt; 0 )</div><div class="line">    {</div><div class="line">        <span class="comment">// begin &quot;painting&quot; the distance transform result</span></div><div class="line">        dist *= 5000;</div><div class="line">        <a name="a7"></a><a class="code" href="../../d7/dcc/group__core__utils__softfloat.html#ga8bc36646a43b82baa15f151a973fb0c5">pow</a>(dist, 0.5, dist);</div><div class="line"></div><div class="line">        <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> dist32s, dist8u1, dist8u2;</div><div class="line"></div><div class="line">        dist.<a name="a8"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#adf88c60c5b4980e05bb556080916978b">convertTo</a>(dist32s, <a name="a9"></a><a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga4067910fc388075c3ea3aa14393e83b9">CV_32S</a>, 1, 0.5);</div><div class="line">        dist32s &amp;= Scalar::all(255);</div><div class="line"></div><div class="line">        dist32s.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#adf88c60c5b4980e05bb556080916978b">convertTo</a>(dist8u1, <a name="a10"></a><a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga32b18d904ee2b1731a9416a8eef67d06">CV_8U</a>, 1, 0);</div><div class="line">        dist32s *= -1;</div><div class="line"></div><div class="line">        dist32s += Scalar::all(255);</div><div class="line">        dist32s.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#adf88c60c5b4980e05bb556080916978b">convertTo</a>(dist8u2, <a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga32b18d904ee2b1731a9416a8eef67d06">CV_8U</a>);</div><div class="line"></div><div class="line">        <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> planes[] = {dist8u1, dist8u2, dist8u2};</div><div class="line">        <a name="a11"></a><a class="code" href="../../d2/de8/group__core__array.html#ga7d7b4d6c6ee504b30a20b1680029c7b4">merge</a>(planes, 3, dist8u);</div><div class="line">    }</div><div class="line">    <span class="keywordflow">else</span></div><div class="line">    {</div><div class="line">        dist8u.create(labels.size(), <a name="a12"></a><a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga88c4cd9de76f678f33928ef1e3f96047">CV_8UC3</a>);</div><div class="line">        <span class="keywordflow">for</span>( <span class="keywordtype">int</span> i = 0; i &lt; labels.rows; i++ )</div><div class="line">        {</div><div class="line">            <span class="keyword">const</span> <span class="keywordtype">int</span>* ll = (<span class="keyword">const</span> <span class="keywordtype">int</span>*)labels.ptr(i);</div><div class="line">            <span class="keyword">const</span> <span class="keywordtype">float</span>* dd = (<span class="keyword">const</span> <span class="keywordtype">float</span>*)dist.ptr(i);</div><div class="line">            <a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga65f85814a8290f9797005d3b28e7e5fc">uchar</a>* d = (<a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga65f85814a8290f9797005d3b28e7e5fc">uchar</a>*)dist8u.ptr(i);</div><div class="line">            <span class="keywordflow">for</span>( <span class="keywordtype">int</span> j = 0; j &lt; labels.cols; j++ )</div><div class="line">            {</div><div class="line">                <span class="keywordtype">int</span> idx = ll[j] == 0 || dd[j] == 0 ? 0 : (ll[j]-1)%8 + 1;</div><div class="line">                <span class="keywordtype">float</span> <a name="a13"></a><a class="code" href="../../d6/d84/namespacecv_1_1quality_1_1quality__utils.html#ae55d1c89ff5761730174745401162743">scale</a> = 1.f/(1 + dd[j]*dd[j]*0.0004f);</div><div class="line">                <span class="keywordtype">int</span> b = <a name="a14"></a><a class="code" href="../../db/de0/group__core__utils.html#ga085eca238176984a0b72df2818598d85">cvRound</a>(colors[idx][0]*scale);</div><div class="line">                <span class="keywordtype">int</span> g = <a class="code" href="../../db/de0/group__core__utils.html#ga085eca238176984a0b72df2818598d85">cvRound</a>(colors[idx][1]*scale);</div><div class="line">                <span class="keywordtype">int</span> r = <a class="code" href="../../db/de0/group__core__utils.html#ga085eca238176984a0b72df2818598d85">cvRound</a>(colors[idx][2]*scale);</div><div class="line">                d[j*3] = (<a name="a15"></a><a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga65f85814a8290f9797005d3b28e7e5fc">uchar</a>)b;</div><div class="line">                d[j*3+1] = (<a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga65f85814a8290f9797005d3b28e7e5fc">uchar</a>)g;</div><div class="line">                d[j*3+2] = (<a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga65f85814a8290f9797005d3b28e7e5fc">uchar</a>)r;</div><div class="line">            }</div><div class="line">        }</div><div class="line">    }</div><div class="line"></div><div class="line">    <a name="a16"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(<span class="stringliteral">&quot;Distance Map&quot;</span>, dist8u );</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> help(<span class="keyword">const</span> <span class="keywordtype">char</span>** argv)</div><div class="line">{</div><div class="line">    printf(<span class="stringliteral">&quot;\nProgram to demonstrate the use of the distance transform function between edge images.\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;Usage:\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;%s [image_name -- default image is stuff.jpg]\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;\nHot keys: \n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;\tESC - quit the program\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;\tC - use C/Inf metric\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;\tL1 - use L1 metric\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;\tL2 - use L2 metric\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;\t3 - use 3x3 mask\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;\t5 - use 5x5 mask\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;\t0 - use precise distance transform\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;\tv - switch to Voronoi diagram mode\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;\tp - switch to pixel-based Voronoi diagram mode\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;\tSPACE - loop through all the modes\n\n&quot;</span>, argv[0]);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">const</span> <span class="keywordtype">char</span>* keys =</div><div class="line">{</div><div class="line">    <span class="stringliteral">&quot;{help h||}{@image |stuff.jpg|input image file}&quot;</span></div><div class="line">};</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main( <span class="keywordtype">int</span> argc, <span class="keyword">const</span> <span class="keywordtype">char</span>** argv )</div><div class="line">{</div><div class="line">    <a name="_a17"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html">CommandLineParser</a> parser(argc, argv, keys);</div><div class="line">    help(argv);</div><div class="line">    <span class="keywordflow">if</span> (parser.<a name="a18"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a8c41cf242b2ad8c0472e3b57893ef200">has</a>(<span class="stringliteral">&quot;help&quot;</span>))</div><div class="line">        <span class="keywordflow">return</span> 0;</div><div class="line">    <span class="keywordtype">string</span> filename = parser.<a name="a19"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a190215863579a6d244dccfd261ee0224">get</a>&lt;<span class="keywordtype">string</span>&gt;(0);</div><div class="line">    gray = <a name="a20"></a><a class="code" href="../../d4/da8/group__imgcodecs.html#ga288b8b3da0892bd651fce07b3bbd3a56">imread</a>(<a name="a21"></a><a class="code" href="../../d6/dba/group__core__utils__samples.html#ga3a33b00033b46c698ff6340d95569c13">samples::findFile</a>(filename), 0);</div><div class="line">    <span class="keywordflow">if</span>(gray.empty())</div><div class="line">    {</div><div class="line">        printf(<span class="stringliteral">&quot;Cannot read image file: %s\n&quot;</span>, filename.c_str());</div><div class="line">        help(argv);</div><div class="line">        <span class="keywordflow">return</span> -1;</div><div class="line">    }</div><div class="line"></div><div class="line">    <a name="a22"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b">namedWindow</a>(<span class="stringliteral">&quot;Distance Map&quot;</span>, 1);</div><div class="line">    <a name="a23"></a><a class="code" href="../../d7/dfc/group__highgui.html#gaf78d2155d30b728fc413803745b67a9b">createTrackbar</a>(<span class="stringliteral">&quot;Brightness Threshold&quot;</span>, <span class="stringliteral">&quot;Distance Map&quot;</span>, &amp;edgeThresh, 255, onTrackbar, 0);</div><div class="line"></div><div class="line">    <span class="keywordflow">for</span>(;;)</div><div class="line">    {</div><div class="line">        <span class="comment">// Call to update the view</span></div><div class="line">        onTrackbar(0, 0);</div><div class="line"></div><div class="line">        <span class="keywordtype">char</span> c = (char)<a name="a24"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7">waitKey</a>(0);</div><div class="line"></div><div class="line">        <span class="keywordflow">if</span>( c == 27 )</div><div class="line">            <span class="keywordflow">break</span>;</div><div class="line"></div><div class="line">        <span class="keywordflow">if</span>( c == <span class="charliteral">&#39;c&#39;</span> || c == <span class="charliteral">&#39;C&#39;</span> || c == <span class="charliteral">&#39;1&#39;</span> || c == <span class="charliteral">&#39;2&#39;</span> ||</div><div class="line">            c == <span class="charliteral">&#39;3&#39;</span> || c == <span class="charliteral">&#39;5&#39;</span> || c == <span class="charliteral">&#39;0&#39;</span> )</div><div class="line">            voronoiType = -1;</div><div class="line"></div><div class="line">        <span class="keywordflow">if</span>( c == <span class="charliteral">&#39;c&#39;</span> || c == <span class="charliteral">&#39;C&#39;</span> )</div><div class="line">            distType0 = <a name="a25"></a><a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaa2bfbebbc5c320526897996aafa1d8eba507b16eb5ef95ea784ca1b3cb7b0d7ee">DIST_C</a>;</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span>( c == <span class="charliteral">&#39;1&#39;</span> )</div><div class="line">            distType0 = <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaa2bfbebbc5c320526897996aafa1d8ebae5b2dfaf2ba5024d7ce47885001fad86">DIST_L1</a>;</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span>( c == <span class="charliteral">&#39;2&#39;</span> )</div><div class="line">            distType0 = <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaa2bfbebbc5c320526897996aafa1d8ebaff0d1f5be0fc152a56a9b9716d158b96">DIST_L2</a>;</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span>( c == <span class="charliteral">&#39;3&#39;</span> )</div><div class="line">            maskSize0 = <a name="a26"></a><a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaaa68392323ccf7fad87570e41259b497a520d4f90e1e37d13d7592fd295a6b5b2">DIST_MASK_3</a>;</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span>( c == <span class="charliteral">&#39;5&#39;</span> )</div><div class="line">            maskSize0 = <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaaa68392323ccf7fad87570e41259b497a8a8b17ed6012f6ce42e56f302c07d481">DIST_MASK_5</a>;</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span>( c == <span class="charliteral">&#39;0&#39;</span> )</div><div class="line">            maskSize0 = <a name="a27"></a><a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaaa68392323ccf7fad87570e41259b497a71e13e06c1d12eabd2acd2669f94f9ca">DIST_MASK_PRECISE</a>;</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span>( c == <span class="charliteral">&#39;v&#39;</span> )</div><div class="line">            voronoiType = 0;</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span>( c == <span class="charliteral">&#39;p&#39;</span> )</div><div class="line">            voronoiType = 1;</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span>( c == <span class="charliteral">&#39; &#39;</span> )</div><div class="line">        {</div><div class="line">            <span class="keywordflow">if</span>( voronoiType == 0 )</div><div class="line">                voronoiType = 1;</div><div class="line">            <span class="keywordflow">else</span> <span class="keywordflow">if</span>( voronoiType == 1 )</div><div class="line">            {</div><div class="line">                voronoiType = -1;</div><div class="line">                maskSize0 = <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaaa68392323ccf7fad87570e41259b497a520d4f90e1e37d13d7592fd295a6b5b2">DIST_MASK_3</a>;</div><div class="line">                distType0 = <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaa2bfbebbc5c320526897996aafa1d8eba507b16eb5ef95ea784ca1b3cb7b0d7ee">DIST_C</a>;</div><div class="line">            }</div><div class="line">            <span class="keywordflow">else</span> <span class="keywordflow">if</span>( distType0 == <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaa2bfbebbc5c320526897996aafa1d8eba507b16eb5ef95ea784ca1b3cb7b0d7ee">DIST_C</a> )</div><div class="line">                distType0 = <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaa2bfbebbc5c320526897996aafa1d8ebae5b2dfaf2ba5024d7ce47885001fad86">DIST_L1</a>;</div><div class="line">            <span class="keywordflow">else</span> <span class="keywordflow">if</span>( distType0 == <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaa2bfbebbc5c320526897996aafa1d8ebae5b2dfaf2ba5024d7ce47885001fad86">DIST_L1</a> )</div><div class="line">                distType0 = <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaa2bfbebbc5c320526897996aafa1d8ebaff0d1f5be0fc152a56a9b9716d158b96">DIST_L2</a>;</div><div class="line">            <span class="keywordflow">else</span> <span class="keywordflow">if</span>( maskSize0 == <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaaa68392323ccf7fad87570e41259b497a520d4f90e1e37d13d7592fd295a6b5b2">DIST_MASK_3</a> )</div><div class="line">                maskSize0 = <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaaa68392323ccf7fad87570e41259b497a8a8b17ed6012f6ce42e56f302c07d481">DIST_MASK_5</a>;</div><div class="line">            <span class="keywordflow">else</span> <span class="keywordflow">if</span>( maskSize0 == <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaaa68392323ccf7fad87570e41259b497a8a8b17ed6012f6ce42e56f302c07d481">DIST_MASK_5</a> )</div><div class="line">                maskSize0 = <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaaa68392323ccf7fad87570e41259b497a71e13e06c1d12eabd2acd2669f94f9ca">DIST_MASK_PRECISE</a>;</div><div class="line">            <span class="keywordflow">else</span> <span class="keywordflow">if</span>( maskSize0 == <a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaaa68392323ccf7fad87570e41259b497a71e13e06c1d12eabd2acd2669f94f9ca">DIST_MASK_PRECISE</a> )</div><div class="line">                voronoiType = 0;</div><div class="line">        }</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="keywordflow">return</span> 0;</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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